Andrej Predin (Author), Ignacijo Biluš (Author)

Abstract

V prispevku je podana analiza prerotacijskega toka v vstopnem cevovodu radialnih turbostrojev, ki se izraziteje pojavlja pri delnem obratovanju stroja, torej zunaj preračunske točke turbostroja. Teoretično se prerotacijski tok pojavlja v vstopnem cevovodu pred vstopom v radialni rotor kot posledica delovanja dejanskega rotorja s končnim številom rotorskih lopatic, ki ustvarjajo rotirajoče rotorske kanale, v katerih nastopajo relativni vrtinčni tokovi znotaj kanala, pa tudi okrog rotorskih lopatic. Posledica tega relativnega toka je tudi odlepljanje toka od površine rotorske lopatice, predvsem ob vstopnem robu. Jakost in smer preotacijskega toka sta odvisni od obratovalneg režima, predvsem od pretoka, ki določa smer prerotacijskega toka. Izvedena je eksperimentalna raziskava v vstopnem cevovodu radialnega ventilatorja. Uporabljen je rotameter z ravnimi krilci v osni smeri vstopnega cevovoda, ki je postavljen v vstopni cevovod na razdalji poldrugega premera cevovoda od vstopnega robu rotorskih lopatic. Meritve so izvedene pri različnih vrtilnih frekvencah rotorja in različnih obratovalnih pretokih.

Keywords

turbostroji;radialni ventilatorji;prerotacijski tok;meritve tokov;analiza tokov;

Data

Language: Slovenian
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UM FS - Faculty of Mechanical Engineering
Publisher: Association of Mechanical Engineers and Technicians of Slovenia et al.
UDC: 62-25:621.63:532.57
COBISS: 5545238 Link will open in a new window
ISSN: 0039-2480
Parent publication: Strojniški vestnik
Views: 935
Downloads: 61
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Other data

Secondary language: English
Secondary title: Prerotation flow at the entrance to a radial impeller
Secondary abstract: In the following paper an analysis is given of the prerotation flow in the entrance pipe of a radial turbomachine which occurs at partial load, i.e. during operartion under out-of-design conditions. Theoretically, the prerotation flow appears in the entrance pipe before the entrance in the radial impeller as a result of the real radial impeller operation. The final number of blades creates the impeller channels where the relative whirl flow exists, in addition to the around the the individual impeller blades. The result of the relative flow is also the separation of flow from the surface of the blade, especially at the entrance edge. The prerotation flow magnitude and direction depend on the operating regime, especially on the operating capacity. The experimental research is carried out at the entrance pipe of the radial fan. An anemometer with straight blades that are parallel to the pipe axis is used and placed at a distance of one and a half pipe diameters in front of the entrance edge of the impeller blades. The measurements were performed at three different impeller speeds and at different operating capacities.
Secondary keywords: turbomachinery;radial fans;prerotation flow;flow measurements;flow analysis;
URN: URN:NBN:SI
Type (COBISS): Not categorized
Pages: str. 276-290
Volume: ǂLetn. ǂ46
Issue: ǂšt. ǂ5
Chronology: 2000
ID: 1749125
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